Tests fixes, audit progress, UI completions

src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Builders/AGENTS.md

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+# BinaryIndex Builders Charter
+
+## Mission
+Own reproducible build orchestration and function-level fingerprinting for BinaryIndex. Keep outputs deterministic and offline-friendly.
+
+## Responsibilities
+- Maintain `StellaOps.BinaryIndex.Builders` and related interfaces.
+- Keep builder options deterministic and safe for air-gapped execution.
+- Surface open work on `TASKS.md`; update statuses (TODO/DOING/DONE/BLOCKED/REVIEW).
+
+## Key Paths
+- `ReproducibleBuildJobTypes.cs`
+- `PatchDiffEngine.cs`
+- `BuilderOptions.cs`
+
+## Coordination
+- BinaryIndex owners for fingerprinting and builder orchestration.
+- Scanner and Policy teams for downstream consumers.
+
+## Required Reading
+- `docs/modules/binaryindex/architecture.md`
+- `docs/modules/platform/architecture-overview.md`
+
+## Working Agreement
+- 1. Update task status to `DOING`/`DONE` in both corresponding sprint file `/docs/implplan/SPRINT_*.md` and the local `TASKS.md` when you start or finish work.
+- 2. Review this charter and the Required Reading documents before coding; confirm prerequisites are met.
+- 3. Keep changes deterministic (stable ordering, timestamps, hashes) and align with offline/air-gap expectations.
+- 4. Coordinate doc updates, tests, and cross-guild communication whenever contracts or workflows change.
+- 5. Revert to `TODO` if you pause the task without shipping changes; leave notes in commit/PR descriptions for context.

src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Builders/TASKS.md

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+# BinaryIndex Builders Task Board
+
+This board mirrors active sprint tasks for this module.
+Source of truth: `docs/implplan/SPRINT_20251229_049_BE_csproj_audit_maint_tests.md`.
+
+| Task ID | Status | Notes |
+| --- | --- | --- |
+| AUDIT-0112-M | DONE | Maintainability audit for StellaOps.BinaryIndex.Builders. |
+| AUDIT-0112-T | DONE | Test coverage audit for StellaOps.BinaryIndex.Builders. |
+| AUDIT-0112-A | TODO | Pending approval for changes. |